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Devi Eka Septiyani Arifin
Jurusan Teknik Mesin, Politeknik Negeri Bandung
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Rekayasa Ulang Mesin Sangrai Kopi Kapasitas 10 Kg Menggunakan Mekanisme Konveksi Prasetyo Prasetyo; Tantan Sholahuddin; Devi Eka Septiani; Ilham Azmy; Musyafak Musyafak
Piston: Journal of Technical Engineering Vol 6, No 2 (2023)
Publisher : Prodi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v6i2.24976

Abstract

Proses sangrai kopi adalah proses yang sangat penting sebelum proses grinder. Proses sangrai menciptakan rasa, aroma, kadar air, kadar kafein dan keasaman dalam biji kopi. Petani kopi Lembaga Masyarakat Desa Kopi (LMDH) menggunakan mesin sangrai kopi tipe rotari dalam proses penyangraian kopi secara konduksi. Namun, mesin sangrai yang digunakan memiliki beberapa kekurangan yang berdampak pada kualitas hasil sangrai yang tidak merata (warna medium /coklat tua 10% dan dark 90%). Sehingga dilakukan proses rekayasa ulang dalam rangka menghasilkan hasil sangrai yang inginkan. Rekaya ulang ini akan dirancang mesin sangrai dengan menggunakan metode pemanasan konveksi. Berdasarkan buku Pahl & Beitz proses perancangan terbagi dalam tiga tahapan yaitu: kajian produk eksisting, langkah perancangan konsep alat dan tahap embodiment design. Langkah kajian produk eksisting berupa identifikasi masalah terhadap mesin yang sudah ada di lapangan. Tahap perencanaan konsep, brainstorming untuk mendapatkan konsep rancangan yang optimal. Tahap perencanaan detail, perhitungan bagian kritis dalam desain. Luaran dari penelitian ini berupa konsep rancangan rekayasa ulang, implementasi hasil rancangan serta pengujian lapangan terhadap mesin sangrai kopi. Rancangan mesin sangrai menggunakan 1 buah silinder yang dipanaskan secara konduksi serta 1 buah silinder berlubang tempat penyimpanan biji kopi dengan jarak 5 mm antar kedua silinder. Kopi diputar di dalam silinder menggunakan tabung berlubang yang diputar sehingga kopi dapat tersangrai sempurna. Konsep rancangan terpilih menggunakan motor dengan daya 0.3 Kw, gearbox dengan ratio 1:20, luaran putaran 70 rpm, diameter poros 30 mm dan bantalan yang kuat bertahan sampai 5 tahun. Hasil pengujian menunjukan sangrai biji kopi dengan rasio warna medium (coklat tua) sebesar 70% medium (coklat tua) dan 30% light (coklat muda), dengan temperatur ruang 200 0C serta waktu pemanasan sebesar 21 menit untuk berat kopi seberat 10kg. Komsumsi energi yang digunakan selama proses penyangraian sebesar 0,105 kWh.
Pengaruh Sudut Die Penarikan Kawat Baja AISI 1006 dengan menggunakan FEM Muliastri, Destri; Lesmana, Prayoga; Septiyani, Devi Eka
Jurnal Rekayasa Mesin Vol 17, No 2 (2022): Volume 17, Nomor 2, Agustus 2022
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v17i2.3278

Abstract

Pembuatan kawat umumnya termasuk dalam pengerjaan dingin atau coldworking yang berarti proses pengerjaan dilakukan dibawah suhu rekristalisasi dari logam tersebut, pengerjaan dingin akan mempengaruhi sifat mekanik diantaranya kekerasan, kekuatan dan keuletan. Wire drawing mampu menunjukan perubahan sifat mekanik tersebut dan parameter yang mempengaruhi ialah sudut cetakan atau die, temperatur, pelumas dan juga persentase reduksi. Metode dari penelitian ini ialah membandingkan hasil simulasi pada software Ansys Workbench 19.0 dan hasil perhitungan dengan teori yang sudah ada, dengan tujuan mengetahui pengaruh dari variasi sudut die terhadap nilai tegangan alir dan gaya penarikan. Dalam penelitian ini material wire yang digunakan ialah baja AISI 1006 ditarik melalui beberapa variasi sudut die 12º, 14º dan 16º, dengan koefisien gesek 0,03 untuk masing-masing persentase reduksi kawat 17,36%; 9,75%; dan 19,95%. Hasil yang didapat dari penelitian ini adalah rata-rata tegangan alir dan gaya penarikan. Persentase perbedaan hasil simulasi dan teoritis dari rata-rata tegangan alir dan gaya penarikan memiliki rata-rata sebesar secara berurutan 1,47% dan 8,35%, dengan nilai tegangan alir terbesar 158,508 Mpa dan gaya penarikan terbesar 502,63 N .Kata kunci: Baja AISI 1006; Finite Element Methode, Sudut die, Wire Drawing
Pengaruh Variasi Temperatur Proses Austempering Terhadap Mikrostruktur dan Sifat Mekanik Baja Armour Slamet Sutjipto; Ilham Azmy; Destri Muliastri; Devi Eka Septiyani Arifin
Manutech : Jurnal Teknologi Manufaktur Vol. 15 No. 01 (2023): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v15i01.264

Abstract

Armour steel is a medium-carbon steel which is widely used in military and defense industries owing to its ability to protect from projectile and bullet pressure. However, this armour steel still posses mechanical limitation aspect, thus it is needed to engineer for improvement. Therefore, the aim of this research is to undergo mechanical properties engineering by using heat treatment method of austempering within temperature variations of 200, 250, 350, 450, and 500 oC . Experimental results show that austempering process affected to fraction quantity of phase and microstructure of ferrite, pearlite, and bainite. Armour steel resulted by austempering process in temperature 500 oC depicts microstructure transformation and mechanical properties improvement significantly. Microstructure transformation along with proportional fraction volume phases of upper bainite, ferrite, and pearlite highly beneficial to increase impact strength dan ductility of armour steel. Thereby, armour steel resulted by austempering process in temperature 500 oC has thoroughly increased its mechanical properties which capable to be applied in military and defense industries.
PELATIHAN SOLIDWORKS UNTUK MENINGKATKAN PENGETAHUAN MECHANICAL DESIGN ASSOCIATE PADA SISWA SMKN 2 BANDUNG Budi Triyono; Destri Muliastri; Devi Eka Septiyani A; Heri Widiantoro; Rudy Yuni W
Aptekmas Jurnal Pengabdian pada Masyarakat Vol 6 No 3 (2023): APTEKMAS Volume 6 Nomor 3 2023
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36257/apts.v6i3.6145

Abstract

One of the competencies needed by technicians and engineers in the field of mechanical engineering is to be able to master software engineering in the design and design of a product. CAD (Computer Aided Design) is a computer application in design activities. Students of SMKN 2 Bandung, one of the vocational schools that has a Department of Drawing Engineering. Students of SMKN 2 Bandung already know material related to CAD but still do not know about Solidworks software, this is because there is no licensed software available at SMKN 2 Bandung. The Department of Mechanical Engineering, Politeknik Negeri Bandung, has licensed Solidworks software and provides SolidWorks certification. So based on this issue, Solidworks knowledge improvement was carried out At SMKN 2 Bandung. The purpose of this activity is to improve the competence of Human Resources and increase competitiveness, especially in the millennial generation. The training process begins with a pre-test that aims to measure the initial level of knowledge of SMKN 2 Bandung students related to Solidworks Software, then the introduction and material related to Solidworks, and at the end of the training an evaluation is carried out with a CSWA Trial Exam, and a post-test. The results of the training that has been carried out on 15 participants, show an improvement in the mastery of CAD Solidworks software.
The Characterization of Mechanical and Chemical Properties of Recycled Styrofoam Waste Employing Extrusion Process Budi Triyono; Destri Muliastri; Devi Eka Septiyani Arifin
Jurnal Rekayasa Mesin Vol 18, No 2 (2023): Volume 18, Nomor 2, Agustus 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i2.4615

Abstract

Styrofoam waste is a polystyrene plastic-based waste in the form of foam with low density. Scavengers or recyclers are not interested in receiving styrofoam waste because of its light density which makes it ineffective in transportation and storage. Styrofoam waste can actually be converted into solid polystyrene products through a thermal-extrusion process but data regarding the optimum operating temperature and the characteristics of the resulting solid polystyrene products are not yet available. The purpose of this study was to investigate the properties of solid polystyrene products resulting from recycled styrofoam waste and determine the optimum temperature of the thermal-extrusion treatment process to be compared with the characteristics of the original polystyrene based on the results of tensile and impact tests. In this study, the processing was carried out using the thermal-extrusion method; Styrofoam is melted and extruded into a mold to produce polystyrene solids. The research was carried out with variations in extrusion temperature at 180°C, 200°C, and 220°C. The polystyrene solids are then molded into tensile and impact test specimens by injection molding. The results showed that the optimal extrusion temperature was 200°C with tensile and impact strength values of 27.55 MPa and 1,069 j/m2, respectively. Compared to the original polystyrene, the tensile strength value is 25.3% lower and the impact strength value is 29.5% lower. The decrease in the tensile and impact strength values is due to the shortening of the molecular bonds in the recycled polystyrene during the thermal-extrusion treatment process. Even though the tensile strength and impact are still lower, the use of styrofoam waste using the thermal-extrusion method has the potential to be developed at the production and commercialization stage because the resulting product has good economic value and can also reduce the use of original polystyrene and at the same time can solve the problem of styrofoam waste.
Pembuatan Konsep Alat Preparasi Material Cangkang Kapsul Lunak Menggunakan Metode Pahl Dan Beitz Budi Triyono; Riovano Putranto; Devi Eka Septiyani Arifin
Manutech : Jurnal Teknologi Manufaktur Vol. 16 No. 01 (2024): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v16i01.294

Abstract

Softgel capsule is a capsule with soft shell texture and is used for fluid or semi-solid medicine substance. Research about softgel capsule in Politeknik Negeri Bandung uses a preparation device to mix the soft capsule shell ingredients. In its operation, this machine has several problems: ineffective method of loading and unloading of materials, unsuitable power for the mixing motor and heating element, and the control system still needs to be improved. Based on these problems, it is neccesary to reverse engineer the preparation device to get better design results so that the device can be operated more effectively. This study consists of three stages: planning, concept generation, and concept evaluation. At the planning stage, data is collected and compiled using the Quality Function Deployment (QFD) method to support the creation of requirement lists. In concept generation stage a design concept was created using the Pahl & Beitz method which was then evaluated using the Pugh weighting method until the final concept was obtained. There are three subfunctions: (1) lifting mechanism, (2) control system, and (3) unloading mechanism. The results of this study are a design concept with rack & pinion lifting mechanism, electrical control system, and sliding valve unloading mechanism.
Rancang Bangun Mesin Pencacah Plastik Pet dengan Kapasitas 20 Kg/Jam Arifin, Devi Eka Septiyani; Widiatmoko, Rudy Yuni; Prayadi, Aditya Anggara
JURNAL CRANKSHAFT Vol 7, No 3 (2024): Jurnal Crankshaft Vol.7 No.3 (2024)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v7i3.13249

Abstract

Shredding is one of the common recycling methods used for plastic waste processing. Along with the development of the era, conventional tools have begun to change to semi-automatic. Therefore, a shredding machine is needed for plastic waste processing with an automatic sensor system to facilitate operation. This design aims to determine the performance of a PET plastic shredding machine with the shredder shredding method. Pahl and Beitz is the method used in making this tool. In accordance with the method applied, the manufacture of the tool starts from planning, concept design, shape design, detailed design, documentation creation and realization of the tool. The testing process is carried out by testing the function of the machine and the function of the automatic sensor. The designed shredder machine has the following specifications: Dimensions of the tool are 950 x 365 x 1060 mm, capacity is 20 kg/hour, 3 phase ½ HP dynamo motor, rotation speed is 70 rpm, number of blades is 14 and material used on the blade is AISI 1080. The test results of this tool show that the tool can work to shred PET plastic, can shred 1 kg of plastic bottles in 2 minutes 45 seconds, the first shredded result is 150 mm maximum smallest size is 16 mm with 3 shredding processes, and can be operated with a sensor control system for the tool's work process. Keywords: shredding machine, garbage, plastic
Penerapan Insinerator Sampah Sederhana dalam Mengatasi Masalah Penumpukan Sampah di Desa Sariwangi Defrianto Pratama; Rahmawati Hasanah; Yunita Citra Dewi; Destri Muliastri; Devi Eka Septiyani Arifin; Muhammad Rizki Zuhri; Zainuddin Zainuddin; Ajeng Ayu Milanti; Sri Widarti
ABDIMAS TERAPAN : Jurnal Pengabdian Kepada Masyarakat Terapan Vol. 3 No. 1 (2025): Juni: ABDIMAS TERAPAN: Jurnal Pengabdian Kepada Masyarakat Terapan
Publisher : Politeknik Kampar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59061/abdimasterapan.v3i1.998

Abstract

Waste management is a major issue in Sariwangi Village, West Bandung Regency, due to the lack of public knowledge, skills, and awareness regarding technology-based waste processing. This problem is exacerbated by inadequate equipment and low community participation. To address these challenges, an incineration method was introduced through a community service program involving problem identification, literature review, awareness campaigns, waste separation, provision of equipment, and training on the use of waste processing technology. The program also developed strategies to enhance community involvement in waste management. The expected outcomes include improved knowledge and skills, availability of proper equipment, and increased awareness and participation in maintaining environmental cleanliness. This approach aims to create a cleaner, healthier, and more sustainable village environment. Keywords: Waste management; Incineration technology; Incinerator
Pengaruh Variasi Holding Time terhadap Mikrostruktur dan Sifat Mekanik AA 6061-T6 Arifin, Devi Eka Septiyani; Bintoro, Waluyo Musiono; Setiawan, Dibyo; Muliastri, Destri; Zen, Elfiah Fadhilah
JURNAL CRANKSHAFT Vol 7, No 1 (2024): Jurnal Crankshaft Vol.7 No.1 (2024)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/crankshaft.v7i1.12099

Abstract

Aluminium Alloy 6061 merupakan jenis Aluminium seri 6xxx yang memiliki sifat mekanik baik seperti ketahanan lelah, keuletan, ringan, mampu mesin, dan kemampuan bentuk yang tinggi. Akan tetapi, Aluminium Alloy memiliki kelemahan dari segi kekuatan yang lebih rendah jika dibandingkan dengan Aluminium seri 2xxx dan 7xxx. Sehingga dapat dioptimalkan, salah satunya melalui proses perlakuan panas T6. Proses ini dimulai dengan tahap solution treatment pada suhu 540°C selama 1 jam dan quenching menggunakan air. Selanjutnya, dilakukan artificial aging pada suhu 165°C dengan variasi waktu penahanan 1 jam, 3 jam, 5 jam, dan 7 jam. Penelitian ini bertujuan untuk mengamati perubahan kekuatan dan kekerasan Aluminium Alloy 6061 sebelum dan setelah age hardening. Hasil penelitian menunjukkan bahwa kekuatan tarik dan kekerasan optimum tercapai pada waktu penahanan 5 jam, dengan kekuatan tarik 293,9 MPa dan kekerasan 109 HV. Namun, pada penahanan 7 jam, kekuatan tarik menurun menjadi 727,2 MPa dan kekerasan menjadi 70,2 HV.
Analisis Kekuatan Fishing Tools Holder 50.000 lbs menggunakan Metode Finite Element Widiantoro, Heri; Arifin, Devi Eka Septiyani; Setiawan, Dibyo; Pasya, Azdane Peprial Indika
JURNAL CRANKSHAFT Vol 6, No 3 (2023): Jurnal Crankshaft Vol.6 No.3 (2023)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/crankshaft.v6i3.11557

Abstract

Finite element numerical simulation (FEA) has a function to analyze the design model and as a validation of the analysis results against manual calculations. FEA simulation uses specialized software to save time and cost. The purpose of the FEA simulation on this design model is to analyze the strength of the design model against a deformation. In this study, a strength test will be carried out on one of the sub-assemblies on the fishing equipment tensile and compressive testing machine, namely the fishing tools holder sub-assembly. The reason for the simulation is that the sub-assembly is directly related to compressive or tensile forces with relatively large units. The material used for this sub-assembly design is SS400 material or ASTM A36 Carbon Steel. The simulation process was carried out in 10 iterations using the curvature-based mesh method with mesh size settings of 10, 9, 8, 7, 6, 5.8, 5.6, 5.4, 5.2, and 5. The maximum stresses that occurred and reached convergence were at mesh sizes 5.8, 5.6, 5.4, and 5.2 in sequence with stress values of 137 MPa, 136 MPa, 142 MPa, and 135.7 MPa, respectively. The finite element analysis results show that the fishing tools holder design produces a maximum stress of 142 MPa at the converging area, with a factor of safety (FoS) of 1.8. Based on these simulations, the design of the fishing tools holder can be implemented on the Fishing Equipments Tensile Test and Press Test Machine.
Co-Authors Adnan Rakhmadi Ramadhan Ajeng Ayu Milanti Aqil Murtadho Bintoro, Waluyo Musiono Budi Triyono Budi Triyono Defrianto Pratama Destri Muliastri Dewi, Yunita Citra Fitri Nur Indah Sari Hasanah, Rahmawati Heri Widiantoro Ilham Azmy Januar Nur Rohmah Suprihartini Lesmana, Prayoga Musyafak Musyafak Naufal Afif Pasya, Azdane Peprial Indika Prasetyo Prasetyo Prayadi, Aditya Anggara Riovano Putranto Rudi Rudiana Rudy Yuni W setiawan, Dibyo Slamet Sutjipto Sri Widarti Syafiq Ade Priyatama Tantan Sholahuddin Undiana Bambang Vania Tingting Sirenden Widiatmoko, Rudy Yuni Zainuddin Zainuddin Zainuri (DOI: 10.12962/j24604682.v12i2.1331), Mochamad Zen, Elfiah Fadhilah Zuhri, Muhammad Rizki